Question

110

regexp to allow only one space in between words

rated 0 times [ 114] [ 4] / answers: 1 / hits: 69866 / 11 Years ago, wed, february 12, 2014, 12:00:00

I'm trying to write a regular expression to remove white spaces from just the beginning of the word, not after, and only a single space after the word.

Used RegExp:

var re = new RegExp(/^([a-zA-Z0-9]+s?)*$/);

Test Exapmle:

1) test[space]ing - Should be allowed 

2) testing - Should be allowed 

3) [space]testing - Should not be allowed 

4) testing[space] - Should be allowed but have to trim it 

5) testing[space][space] - should be allowed but have to trim it

Only one space should be allowed. Is it possible?

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efrainjamiry

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answered 11 Years ago gabriellagiselc · Accepted Answer

function validate(s) {

    if (/^(w+s?)*s*$/.test(s)) {

        return s.replace(/s+$/, '');

    }

    return 'NOT ALLOWED';

}

validate('test ing')    // => 'test ing'

validate('testing')     // => 'testing'

validate(' testing')    // => 'NOT ALLOWED'

validate('testing ')    // => 'testing'

validate('testing  ')   // => 'testing'

validate('test ing  ')  // => 'test ing'

BTW, new RegExp(..) is redundant if you use regular expression literal.